Sewing-machine stop-motion.



A. F. FIFIELD.

SEWING MACHINE STOP MOTION.

APPLICATION FILED APR. 8. 1914.

Patented May 23,1916.

WITNESSES: 73 INVENTOR 6\ f MJZW T OR/VEY THE COLUMHXA PLANOGRAPH co.,WASHINGTON, D. c.

1 awr error,

ALBERT F. FIEIELD, F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANU-FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE error-Morrow.

Specification of Letters Patent.

Patented May 23, 1916.

Application filed April 8, 1914. Serial No. 830,345.

Elizabeth, in the county of Union and State of New Jersey, have inventedcertain new and useful Improvements in Sewing-Machine Stop-Motions, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to manually operated means for controlling theoperation of a stop-motion to determine at the will of the operator theperiod of operation of stitching mechanism, and it has for its ob jectto provide means under the control of the operator for rendering thestop-motion tripping means ineffective in performing its normal functionfor arresting the action of the machine.

In its preferred form, the improvement comprises a rotary membercarrying a tripping point adapted for'action upon an inter mediateelement normally arranged to transmit to the stop-motion movementsimparted to said element by the tripping point but movable into and outof operative relation effecting the described resul with an element ofthe stop-motion device. The stop-motion preferably comprises aspring-pressed stop-lever carrying a spring pressed plunger adapted forengagement with a stopping cam upon the main-shaft of a sewing machineand adapted to be held in retracted or inoperative position by means ofa detent lying in the normal range of movement of said intermediateelement. It is evidently immaterial, in the broader aspect of theimprovement, whether the influence of the tripping point upon thestoplever detent be temporarily interrupted manually by theinterposition of the intermediate element movable out of operativerelation with said element of the stop-motion device or some other meansbe employed for In the accompanying drawings, Figure 1 is a perspectiveview of a sewing machine provided with the present improvement, takenfrom the rear side. Fig. 2 is a perspective view, taken from theopposite side, of a portion of the stop-motion controlling mechanism.Fig. 3 is a sectional elevation representing a portion of thestop-lever.

The machine is shown provided with the usual bed-plate 1 and bracket-arm2 in the upper member of which is journaled' the main-shaft 3 carryingupon its rearward end the fast and loose pulleys 4 and 5. In the head ofthe bracket-arm is journaled the usual rectilinearly reciprocatingneedle-bar 6 operatively connected with the main-shaft and carrying theeye-pointed needle 7 cooperating in the production of stitches with asuitable loop-taker beneath the bed-plate.

The machine is provided with thread-cutting mechanism and a stop-motiondevice constructed substantially in accordance with theUnited Statespatent to J. J. Sullivan No. 777,564, dated December 13, 1914, withspecial means of manual control of their time of operation.

The fast pulley 4 has formed integrally therewith or rigidly attachedthereto the stoppingcam 8 adapted for engagement by the plunger-bar 9fitted within a suitable socket of the stop-lever 10 which is pivotallymounted in the oscillatory bearing-plug 11. The plunger-bar 9 is pressedupwardly within its socket by means of the spring 9. The stop-lever 10is pressed normally backward into stopping position 'by means of thespring 12 and'its lateral motion under the momentum of the moving partsis resisted by the thrust-pin 13 with its cushioning spring 14. Thestop-lever carries at its upper end thebelt-shipping fork 15 and isprovided also in its rearward face with a notch 16normally entered bythe hooked extremity 17 of the detent-lever 18 mounted upon the fulcrumstud-screw 19 and pressed normally into operative relation with thestop-lever by means of the spring 20.

A lateral projection 21 of the bracketarm is provided on its rearwardedge with a fiat seat having theprojecting stud-screws 22 entering theelongated apertures 23 in the slides-bar 24 provided with the transversesocket 25 in which is fitted the endwise-movable tripping plug 26provided with the lat- I eral pin 27 passing through a suitable slot inthe socket and pressed normally backward in said socket by means of aspring 28 secured upon the bar 24 by means of the screw 29. One end ofthe pin or plug 26 is adapted for engagement with the forwardlyextending arm of the detent-lever 18, while the opposite end lies in thenormal path of The hub 32 of the cam-wheel is fitted upon the hub 33 ofthe peripherally toothed wheel 34 which is mounted upon the fulcrum-stud35 fixed in the bracket-arm. The cam 31 and toothed wheel 34 are securedtogether to rotate in unison by means of the bolt 36. The gear-wheel 34meshes with a pinion 37 fixed upon one end of the short shaft 38 havingupon its opposite end the bevel-wheel 39 meshing with the bevel pinion40 which is fixed upon the main-shaft 3 and communicates to thecam-wheel 31 through the de scribed connections one rotation for aplurality of rotations of the main-shaft and consequently for aplurality of stitch-forming cycles.

The cam-wheel 31 has in its rearward face the cam-groove 41 entered by afollower in the form of a roller-stud 42 carried by the vibratory lever43 having its split hub loosely journaled upon the hub 44 of thecutter-actuating vibratory lever formed with the dependingarm 45 and theupwardly extending arm 46. The cutter-actuating lever is j ournaled uponthe fulcrum stud-screw 47 tapped into the boss 48 of the bracket-arm.

The lever-arm 46 has pivotally mounted thereon near its hub portion bymeans of the pin 49 the channeled coupling lever 50 adapted to receivethe outer portion of the lever 46 within its channel, as represented inFig. 2. Secured to one edge of the lever 50 by means of screws 51 is thecross-member 52 of a lateral arm 53 carrying the stud-screw 54 andhaving secured thereto by means of the fastening screw 55 the lateralportion of a bent wire passing through said arm and extending therefromlaterally in the form of a pin 56 which enters an aperture in the lowerportion of the slide-bar 24 and serves to connect the slide-bar with thecoupling lever 50.

'The depending lever-arm 45 is formed with a tapered extremity embracedby the lateral fork 57 of the spring-retracted cutter-actuatingslide-bar 58 beneath the bedplate, as shown and described more fully inthe 'said United States Patent No. 777,564, and in my application SerialNo. 830,344, filed simultaneously herewith. The depending stud 59 of thebar 58 enters the forked extremity of the lateral arm 60 of a bellcrankfulcrumed beneath the bed-plate and provided with the rearwardlyextending arm 61 carrying the spring-pressed pin 62 adapted to enter theslot 63 in the lower end of the stop-lever 10.

Pivotally mounted upon the screw-pin 64 between the spaced ears of thebracket 65 is the hub 66 of the starting lever formed with the lateralapertured arm 67 and depending arm 68 normally resting upon the rearwardedge of the stop-lever 10. An adjacent depending arm 69 has secured tothe side face thereof by means of the screw 70 the foot 71 of aforwardly extending rigid arm 72 having attached to its apertured outerend the upper extremity of a spring 73 connected at its opposite end tothe pin 74 by means of which the starting lever is normally main tainedwith the arm 67 in its upper position by which the arm 72 yieldinglyrests upon the stop-pin 75 projecting from the bracketarm.

Extending from the base of the arm 72 is the stud 76 having in its outerend the guidescrew 77 passing through the slot 78 in the rearward end ofthe link 79 whose opposite end is pivotally connected at 80 with theupper end of the latch or detent-lever 81 formed in its forward edgewith the notch 82 to afford a latch-shoulder and pivotally mounted atits lower end upon the studscrew 83. The lever 81 has adjacent itsfulcrum point the rearwardly extending hook 84 to which is connected oneend of the spring 85 having its opposite end attached to the stud-screw54 of the coupling lever arm 53. The spring 85 serves to normally drawdown the coupling-lever arm 53 and thereby efi'ect the coupling of thearms 43 and 46 when in register or overlapping relation, while saidspring also acts to yieldingly press the latch-lever 81 into operativerelation with the arm 53' for prevention of such coupling action. a

The upper or outer extremity of the coupling-lever 50 has upon one ofits faces a lateral wing 50 with an inclined operative edge normallylying within the path of movement of the lateral cam projections 86 uponthe plates 87 adjustably secured upon the periphery of the cam-wheel bymeans of screws 88. By means of these cam projections the disconnectionof the vibratory levers 43 and 46 is insured in each semi-rotation ofthe controlling cam, and thus disconnection is maintained so long as thestarting lever 67 68 69 is in running position with the lateralarm'depressed, whereby the latch-lever 81 is enabled to snap intooperative engagement with the couplinglever arm 53 for maintaining thecouplinglever 50 retracted from engagement with the lever 43, asrepresented in Fig. 1.

When the. machine is at rest, the upper portion of the stop-lever 10 isthrown backwardly with its plunger-bar in engagement with the stoppingcam, and; as represented in Fig. 2, the plunger-pin 26 is in its loweroperative relation with the detent-lever 18 and the coupling lever 50 isin coupling relation with the vibratory levers 43 and 46. To start astitching operation, the lateral arm 67 of the starting lever is drawndownwardly to running position, wherein it is manually held during astitching period, thus forcing the stop-lever 10 into running positionwherein it is engaged and detained by means of the detent-lever 18 i Theforward movement of the starting lever arm 69 permits the advance of thelink 79 under the action of the spring 85 to cause the detent-lever 81to rest upon the side face of the coupling-lever arm 53. The succeedingengagement of the wing 50 by one of the cam projections 86 causes thedisengagement of the coupling-lever 50 from the lever 43 and the rise ofthe lateral arm 53, which is detained in such retracted position byengagement of the detent-lever 81 therewith, the upward movement of thearm 53 being communicated by the pin 56 to the slide-bar 24 and hence tothe plungerpin 26 which assumes an inoperative position above thestop-motion detent-lever 18, as represented in Fig. 1.

As the actuating lever 43 is vibrated by the controlling cam into andout of register with the coupling lever 50, the latter continues in itsretracted position under the influence of the latch-lever 81, so that novibratory movement of the rock-lever 45 46 is permitted for actuation ofthe threadcutting mechanism and the plunger-pin 26 maintains itselevated position above and out of operative relation with thedetentlever 18. Thus the endwise movements of the plunger-pin impartedby the tripping points of the controlling cam are idle and ineffectivein performing their normal function upon the detent-lever 18.

It will be observed that the holding force applied by the operator tothe startinglever arm 67 need be only sufficient to counterbalance theimpulse of the spring 73, the detent-lever 18 being permitted to remainin operative engagement with the stop-lever 10 during substantially theentire running period of the machine so as to sustain the impulse of thestop-lever spring 12.

When the starting lever is released to permit the machine to come torest. it turns upon its fulcrum-pin 64 under the action of the spring 73upon the arm 72, thus drawing backwardlv the link 79 and disengaging thedetent-lever 81 from the coupling-lever arm 53 so as to permit thecoupling lever to assume coupling relation with the vibratory actuatinglever 43 under the action of the spring 85 as soon as the levers 4.3 and46 come into register in the continued movement of the cam-wheel 31. Thedescent of *the coupling-lever arm 53 produces a like movement of theslide-bar 24 connected therewith, and hence of the plunger-pin 26 whosesucceeding operative movement under the action of one of the trippingpoints 30 causes its engagement with and retraction of the detent-lever18 to permit the stoplever 10 to move into a stopping position whereinits plunger-bar 9 assumes operative relation with the stopping cam 8 forthe arrest of the main-shaft.

lVhile the present improvement is shown &

and described herein combined with the cutter-actuating and controllingmeans forming the subject of my said application, it is evident that themechanism is susceptible of material modification within the scope ofthe invention by providing a more direct connection between the startinglever and the plunger-pin sustaining slide-bar 24L for shifting thelatterinto and out of operative relation with the detent-lever 18. It isalso evident that other means than those shown and described herein maybe employed for operatively connecting the automatically acting trippingpoints with the stop-motion device, so long as the efi'ectiveness of thetripping means is manually controlled.

Having thus set forth the nature of the invention, what I claim hereinis 1. In a sewing machine, in combination, a shaft, driving meanstherefor, a stop motion including a member movable to running positionto establish the connection of said driving means with the shaft, meansfor holding said member in running position, tripping means normallyeffective to release said holding means, thereby permitting said movablemember to move to stopping position, and means actuated by said shaftfor rendering said tripping means ineffective.

2. n a sewing machine, in combination, a shaft, driving means therefor,a stop-motion including a member movable to running position toestablish the connection of said driving means with the shaft, means forholding said member in running position, a continuously moving trippingelement, connections between said tripping element and said holdingmeans normally effective to release the latter, and means for saidconnections ineffective.

3. In a sewing machine, the combination with a shaft, driving meanstherefor, and a stop-motion including means for establishing andcontrolling the connection of said driving means with the shaft, of amember having a working position, a tripping point fiXed thereon, anelement intermediate said member and the stop-motion for connecting saidtripping point with the latter to the interruption of said connectionbetween the shaft and its driving means, and manually controlled meansacting automatically to shift said intermediate element out of the rangeof movement of said tripping point.

4. In a sewing machine, the combination with a shaft, driving meanstherefor, and a stop-motion including a controlling member havingconnected therewith means for establishing operative connection betweenthe driving means and said shaft, and means for arresting the operationof said shaft, of a starting lever acting upon said controlling memberfor throwing the stop-motion into running position, means connected withsaid effect rendering member for tripping the stop-motion to arrest theoperation of said shaft, and means connected with said starting leverand adapted to render said tripping means ineffective.

5. In a sewing machine, the combination with a shaft and a stop-motioncomprising a spring-pressed vibratory lever carrying means forconnecting said shaft with a source of power and means for arresting theoperation of said shaft, of a starting lever for throwing said vibratorylever into running position, a detent for retaining said lever inrunning position, tripping means for said detent, and means connectedwith said starting lever and adapted to render said tripping meansineffective.

(5. In a sewing machine, the combination with a shaft and a stop-motioncomprising a spring-pressed vibratory lever carrying means forconnecting said shaft with a source of power and means for arresting theoperation of said shaft, of a-starting lever for throwing said vibratorylever into running position a detent for retaining said lever in runningposition, a rotary cam provided with a tripping point an intermediateelement between the range of movement of said tripping point and saiddetent, and a connection between the starting lever and saidintermediate element whereby the latter may be temporarily maintainedout of connecting relation between the tripping point and detent.

T. In a sewing machine, the combination with a shaft, driving meanstherefor, a stopmotion including a spring'pressed controlling membercarrying a stopping element and a stopping cam mounted upon said shaftand adapted for operative engagement with said stopping element, asecond cam mounted independently of but connected with said shaft, atripping point fixed thereon, an element normally disposed intermediatesaid controlling member and the range of movement of said trippingpoint, and manually ontrolled shifting means for temporarilyinterrupting the normal operative relation between said intermediateelement and the tripping point.

'8. In a sewing machine, the combination with a shaft and a stop-motioncomprising a spring-pressed vibratory lever for controlling the actionof the same, of a starting lever for throwing said vibratory lever ofthe stop-motion into running position, a detent for retaining saidvibratory lever in running position, a rotary cam provided with atripping point, an intermediate element between the range of movement ofsaid tripping point and said detent, a connection between the startinglever and said intermediate element-wherebythe latter may be temporarilymaintained out of connecting relation between the tripping point and detent, and means independent of said vibratory lever of the stop-motionfor retracting the starting lever and thereby causing said intermediateelement to return to operative position.

9. In a sewing machine, in combination, a shaft, driving means therefor,a stop motion including a spring-pressed member movable to runningposition against the action.

of said spring to establish the connection of said driving means withthe shaft, means for holdin said movable member in runnmg position,manually controlled means,

acting automatically when thrown into operation, for releasing saidholding means, whereby said movable member may move to stoppingposition. 7

10. In a sewing machine, in combination, a shaft, driving meanstherefor, a stop motion mechanism operative when released to stop themachine, said shaft, connections between said moving part and said stopmotion normally effective to release the latter when actuated bysaidmoving part, and means actuated by said shaft for rendering saidconnections ineffective without stopping the machine.

11. In a sewing machine, in combination, a shaft, driving meanstherefor, a stop-motion including a member movable to running positionto establish the connection of said driving means with the shaft,manually operated means for moving said member to running position,holdingmeans for retaining said mov'rble member in running position,automatically acting means controlled by said manually operated meansand acting, when thrown into operation, to release said holding means,whereby said movable member may move to stopping position.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

ALBERT F. FIFIELD.

\Vitnesses \VILLIAM L. BARRON, H. A. KORNEMANN, Jr.

copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Ifatents. Washington, D. C.

a moving part actuated by

